DTC P1635: 5-Volt Reference "A" Circuit: Description
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) provides a 5-volt reference to the following sensors:
- Throttle Position (TP) sensor 1.
- Accelerator Pedal Position (APP) sensor 2.
- A/C pressure sensor.
- Fuel Tank Pressure (FTP) sensor.
- Oil Pressure Sensor (OPS).